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https://www.readbyqxmd.com/read/28343102/acoustic-and-hybrid-3d-printed-electrochemical-biosensors-for-the-real-time-immunodetection-of-liver-cancer-cells-hepg2
#1
Samar Damiati, Seta Küpcü, Martin Peacock, Christoph Eilenberger, Mazin Zamzami, Ishtiaq Qadri, Hani Choudhry, Uwe B Sleytr, Bernhard Schuster
This study presents an efficient acoustic and hybrid three-dimensional (3D)-printed electrochemical biosensors for the detection of liver cancer cells. The biosensors function by recognizing the highly expressed tumor marker CD133, which is located on the surface of liver cancer cells. Detection was achieved by recrystallizing a recombinant S-layer fusion protein (rSbpA/ZZ) on the surface of the sensors. The fused ZZ-domain enables immobilization of the anti-CD133 antibody in a defined manner. These highly accessible anti-CD133 antibodies were employed as a sensing layer, thereby enabling the efficient detection of liver cancer cells (HepG2)...
March 21, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28342898/temperature-induces-significant-changes-in-both-glycolytic-reserve-and-mitochondrial-spare-respiratory-capacity-in-colorectal-cancer-cell-lines
#2
Mihail I Mitov, Jennifer W Harris, Michael C Alstott, Yekaterina Y Zaytseva, B Mark Evers, D Allan Butterfield
Thermotherapy, as a method of treating cancer, has recently attracted considerable attention from basic and clinical investigators. A number of studies and clinical trials have shown that thermotherapy can be successfully used as a therapeutic approach for various cancers. However, the effects of temperature on cancer bioenergetics have not been studied in detail with a real time, in a microplate, label-free detection approach. This study investigate how changes in temperature affect the bioenergetics characteristics (mitochondrial function and glycolysis) of three colorectal cancer (CRC) cell lines utilizing the Seahorse XF96 technology...
March 22, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28342376/label-free-silicon-nanodots-featured-ratiometric-fluorescent-aptasensor-for-lysosomal-imaging-and-ph-measurement
#3
Yanan Zhang, Shan Guo, Shibo Cheng, Xinghu Ji, Zhike He
The homeostasis of lysosomal pH is crucial in cell physiology. Developing small fluorescent nanosensors for lysosome imaging and ratiometric measurement of pH is highly demanded yet challenging. Herein, a pH-sensitive fluorescein tagged aptamer AS1411 has been utilized to covalently modify the label-free fluorescent silicon nanodots via a crosslinker for construction of a ratiometric pH biosensor. The established aptasensor exhibits the advantages of ultrasmall size, hypotoxicity, excellent pH reversibility and good photostability, which favors its application in an intracellular environment...
March 22, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28342375/nanozyme-based-bio-barcode-assay-for-high-sensitive-and-logic-controlled-specific-detection-of-multiple-dnas
#4
Xiaodong Lin, Yaqing Liu, Zhanhui Tao, Jinting Gao, Jiankang Deng, Jinjin Yin, Shuo Wang
Since HCV and HIV share a common transmission path, high sensitive detection of HIV and HCV gene is of significant importance to improve diagnosis accuracy and cure rate at early stage for HIV virus-infected patients. In our investigation, a novel nanozyme-based bio-barcode fluorescence amplified assay is successfully developed for simultaneous detection of HIV and HCV DNAs with excellent sensitivity in an enzyme-free and label-free condition. Here, bimetallic nanoparticles, PtAuNPs, present outstanding peroxidase-like activity and act as barcode to catalyze oxidation of nonfluorescent substrate of amplex red (AR) into fluorescent resorufin generating stable and sensitive "Turn On" fluorescent output signal, which is for the first time to be integrated with bio-barcode strategy for fluorescence detection DNA...
January 5, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28342316/comparison-of-cytomegalovirus-cmv-specific-neutralization-capacity-of-hyperimmunoglobulin-hig-versus-standard-intravenous-immunoglobulin-ivig-preparations-impact-of-cmv-igg-normalization
#5
Matthias Stefan Schampera, Katrin Schweinzer, Harald Abele, Karl Oliver Kagan, Reinhild Klein, Ingo Rettig, Gerhard Jahn, Klaus Hamprecht
BACKGROUND: Based on a non-randomized study of Nigro et al. (2005) the intravenous administration of hyperimmunoglobulins (HIGs) is applied frequently to women with primary CMV-infection as "off-label use" in Germany. OBJECTIVES: In order to describe their CMV-specific neutralization-capacity in vitro, we analyzed the HIG preparations Cytotect(®), and Cytogam(®) as well as the standard intravenous immunoglobulins (IVIG) Octagam(®), Gamunex(®), Kiovig(®). STUDY DESIGN: We performed short-term cell-free CMV neutralization assays (CFNT) and long-term cell-adapted neutralization-plaque-reduction assays (PRANT)...
March 16, 2017: Journal of Clinical Virology: the Official Publication of the Pan American Society for Clinical Virology
https://www.readbyqxmd.com/read/28341197/label-free-quantitative-proteomics-unravels-the-importance-of-rna-processing-in-glioma-malignancy
#6
Baibin Bi, Feng Li, Jisheng Guo, Cuiling Li, Ruirui Jing, Xin Lv, Xinjun Chen, Fengqin Wang, Kazem M Azadzoi, Lin Wang, Yuguang Liu, Jing-Hua Yang
Glioma, one of the most common cancers in human, is classified to different grades according to the degrees of malignancy. Glioblastoma (GBM) is known to be the most malignant (Grade IV) whereas low-grade astrocytoma (LGA, Grade II) is relatively benign. The mechanism underlying the pathogenesis and progression of glioma malignancy remains unclear. Here we report a quantitative proteomic study to elucidate the differences between GBM and LGA using liquid chromatography and tandem mass spectrometry followed by label-free quantification...
March 21, 2017: Neuroscience
https://www.readbyqxmd.com/read/28340485/an-approach-for-liposome-immobilization-using-sterically-stabilized-micelles-ssms-as-a-precursor-for-bio-layer-interferometry-based-interaction-studies
#7
Jakob Wallner, Gabriele Lhota, Markus Schosserer, Karola Vorauer-Uhl
Non-fluidic bio-layer interferometry (BLI) has rapidly become a standard tool for monitoring almost all biomolecular interactions in a label-free, real-time and high-throughput manner. High-efficiency screening methods which measure the kinetics of liposomes with a variety of compounds require the immobilization of liposomes. In this work, a method is described for immobilizing liposomes for interaction studies, based on the biophysical principles of this biosensor platform. The immobilization approach includes the loading of DSPE-PEG(2000)-biotin containing sterically stabilized micelles (SSMs) which are restructured in a buffer change step, resulting in an accessible substrate for liposome immobilization...
March 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28340465/dumbbell-dna-templated-cunps-as-a-nano-fluorescent-probe-for-detection-of-enzymes-involved-in-ligase-mediated-dna-repair
#8
Taiping Qing, Xiaoxiao He, Dinggeng He, Xiaosheng Ye, Jingfang Shangguan, Jinquan Liu, Baoyin Yuan, Kemin Wang
DNA repair processes are responsible for maintaining genome stability. Ligase and polynucleotide kinase (PNK) have important roles in ligase-mediated DNA repair. The development of analytical methods to monitor these enzymes involved in DNA repair pathways is of great interest in biochemistry and biotechnology. In this work, we reported a new strategy for label-free monitoring PNK and ligase activity by using dumbbell-shaped DNA templated copper nanoparticles (CuNPs). In the presence of PNK and ligase, the dumbbell-shaped DNA probe (DP) was locked and could resist the digestion of exonucleases and then served as an efficient template for synthesizing fluorescent CuNPs...
March 21, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28339377/stability-of-clindamycin-hydrochloride-in-pcca-base-suspendit
#9
Yashoda V Pramar, Richard A Graves, Grace A Ledet, Kelly V Phan, Levon A Bostanian, Tarun K Mandal
Clindamycin is an effective antibiotic in the treatment of infections caused by certain gram-positive and gram-negative anaerobic microorganisms. While manufactured forms of the drug for pediatric use are available, there are instances when a compounded liquid dosage form is essential to meet unique patient needs. The purpose of this study was to determine the chemical stability of clindamycin hydrochloride in the PCCA base SuspendIt, a sugar-free, paraben- free, dye-free, and gluten-free thixotropic vehicle containing a natural sweetener obtained from the monk fruit...
September 2016: International Journal of Pharmaceutical Compounding
https://www.readbyqxmd.com/read/28338135/detection-of-chemical-warfare-agent-simulants-and-hydrolysis-products-in-biological-samples-by-paper-spray-mass-spectrometry
#10
Josiah McKenna, Elizabeth S Dhummakupt, Theresa Connell, Paul S Demond, Dennis B Miller, J Michael Nilles, Nicholas E Manicke, Trevor Glaros
Paper spray ionization coupled to a high resolution tandem mass spectrometer (a quadrupole orbitrap) was used to identify and quantitate chemical warfare agent (CWA) simulants and their hydrolysis products in blood and urine. Three CWA simulants, dimethyl methylphosphonate (DMMP), trimethyl phosphate (TMP), and diisopropyl methylphosphonate (DIMP), and their isotopically labeled standards were analyzed in human whole blood and urine. Calibration curves were generated and tested with continuing calibration verification standards...
March 24, 2017: Analyst
https://www.readbyqxmd.com/read/28336726/proteomic-signature-of-acute-liver-failure-from-discovery-and-verification-in-a-pig-model-to-confirmation-in-humans
#11
Jie Wang, Zeyu Sun, Jing Jiang, Daxian Wu, Xiaoli Liu, Zhongyang Xie, Ermei Chen, Danhua Zhu, Chao Ye, Xiaoqian Zhang, Wenqian Chen, Hongcui Cao, Lanjuan Li
Acute liver failure (ALF) is a fatal condition hallmarked by rapid development. The present study aimed to describe the dynamic alterations of serum proteins associated with ALF development, and to seek for novel biomarkers of ALF. Miniature pigs (n=30) were employed to establish ALF models by infusing D-galactosamine (GALN, 1.3g/kg). A total of 1589 serum proteins were compared in pooled serum samples (n=10) before and 36 hours after GALN administration through label-free quantitation (LFQ) based shotgun proteomics...
March 23, 2017: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/28336065/folding-and-dynamics-based-electrochemical-dna-sensors
#12
Rebecca Y Lai
A number of electrochemical DNA sensors based on the target-induced change in the conformation and/or flexibility of surface-bound oligonucleotides have been developed in recent years. These sensors, which are often termed E-DNA sensors, are comprised of an oligonucleotide probe modified with a redox label (e.g., methylene blue) at one terminus and attached to a gold electrode via a thiol-gold bond at the other. Binding of the target to the DNA probe changes its structure and dynamics, which, in turn, influences the efficiency of electron transfer to the interrogating electrode...
2017: Methods in Enzymology
https://www.readbyqxmd.com/read/28335318/a-label-free-and-sensitive-fluorescent-qualitative-assay-for-bisphenol-a-based-on-rolling-circle-amplification-exonuclease-iii-combined-cascade-amplification
#13
Xia Li, Juan Song, Qing-Wang Xue, Fu-Heng You, Xia Lu, Yan-Cong Kong, Shu-Yi Ma, Wei Jiang, Chen-Zhong Li
Bisphenol A (BPA) detection in drinking water and food packaging materials has attracted much attention since the discovery that BPA can interfere with normal physiological processes and cause adverse health effects. Here, we constructed a label-free aptamer fluorescent assay for selective and sensitive detection of BPA based on the rolling circle amplification (RCA)/Exonuclease III (Exo III)-combined cascade amplification strategy. First, the duplex DNA probe (RP) with anti-BPA aptamer and trigger sequence was designed for BPA recognition and signal amplification...
October 21, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335260/a-label-free-microelectrode-array-based-on-one-step-synthesis-of-chitosan-multi-walled-carbon-nanotube-thionine-for-ultrasensitive-detection-of-carcinoembryonic-antigen
#14
Huiren Xu, Yang Wang, Li Wang, Yilin Song, Jinping Luo, Xinxia Cai
Carcinoembryonic antigen (CEA) has been an extensively used tumor marker responsible for clinical early diagnosis of cervical carcinomas, and pancreatic, colorectal, gastric and lung cancer. Combined with micro-electro mechanical system (MEMS) technology, it is important to develop a novel immune microelectrode array (MEA) not only for rapid analysis of serum samples, but also for cell detection in vitro and in vivo. In this work, we depict a simple approach to modify chitosan-multi-walled carbon nanotubes-thionine (CS-MWCNTs-THI) hybrid film through one-step electrochemical deposition and the CS-MWCNTs-THI hybrid films are successfully employed to immobilize anti-CEA for fabricating simple, label-free, and highly sensitive electro-chemical immune MEAs...
July 11, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335211/noise-removal-with-maintained-spatial-resolution-in-raman-images-of-cells-exposed-to-submicron-polystyrene-particles
#15
Linnea Ahlinder, Susanne Wiklund Lindström, Christian Lejon, Paul Geladi, Lars Österlund
The biodistribution of 300 nm polystyrene particles in A549 lung epithelial cells has been studied with confocal Raman spectroscopy. This is a label-free method in which particles and cells can be imaged without using dyes or fluorescent labels. The main drawback with Raman imaging is the comparatively low spatial resolution, which is aggravated in heterogeneous systems such as biological samples, which in addition often require long measurement times because of their weak Raman signal. Long measurement times may however induce laser-induced damage...
April 29, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334974/efficacy-and-safety-of-sequential-use-of-everolimus-in-japanese-patients-with-advanced-renal-cell-carcinoma-after-failure-of-first-line-treatment-with-vascular-endothelial-growth-factor-receptor-tyrosine-kinase-inhibitor-a-multicenter-phase-ii-clinical-trial
#16
Masafumi Oyama, Takayuki Sugiyama, Masahiro Nozawa, Kiyohide Fujimoto, Takeshi Kishida, Go Kimura, Noriaki Tokuda, Shiro Hinotsu, Kojiro Shimozuma, Hideyuki Akaza, Seiichiro Ozono
Objective: Many studies have shown the efficacy of everolimus after pretreatment with vascular endothelial growth factor receptor-tyrosine kinase inhibitors. We investigated the efficacy and safety of everolimus as a second-line treatment after the failure of vascular endothelial growth factor receptor-tyrosine kinase inhibitor therapy in Japanese patients with advanced renal cell carcinoma. Methods: This was an open-label, multicenter, phase II trial conducted in Japan through the central registration system...
March 1, 2017: Japanese Journal of Clinical Oncology
https://www.readbyqxmd.com/read/28334681/fluorescent-proteins-such-as-egfp-lead-to-catalytic-oxidative-stress-in-cells
#17
Douglas Ganini, Fabian Leinisch, Ashutosh Kumar, JinJie Jiang, Erik J Tokar, Christine C Malone, Robert M Petrovich, Ronald P Mason
Fluorescent proteins are an important tool that has become omnipresent in life sciences research. They are frequently used for localization of proteins and monitoring of cells [1,2]. Green fluorescent protein (GFP) was the first and has been the most used fluorescent protein. Enhanced GFP (eGFP) was optimized from wild-type GFP for increased fluorescence yield and improved expression in mammalian systems [3]. Many GFP-like fluorescent proteins have been discovered, optimized or created, such as the red fluorescent protein TagRFP [4]...
March 10, 2017: Redox Biology
https://www.readbyqxmd.com/read/28334626/label-free-electrochemiluminescent-biosensor-for-rapid-and-sensitive-detection-of-pseudomonas-aeruginosa-using-phage-as-highly-specific-recognition-agent
#18
Huan Yue, Yong He, Enci Fan, Lin Wang, Shuguang Lu, Zhifeng Fu
A virulent phage named as PaP1 was isolated from hospital sewage based on a lambda phage isolation protocol. This phage showed a strong and highly specific binding ability to Pseudomonas aeruginosa (P. aeruginosa). Using this isolated phage as a recognition agent, a novel electrochemiluminescent (ECL) biosensor was developed for label-free detection of P. aeruginosa. The biosensor was fabricated through depositing phage-conjugated carboxyl graphene onto the surface of a glass carbon electrode. After specific binding of the host bacteria through the adsorption of P...
March 18, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28333860/cardiovascular-parameters-to-2-years-after-kidney-transplantation-following-early-switch-to-everolimus-without-calcineurin-inhibitor-therapy-an-analysis-of-the-randomized-elevate-study
#19
Hallvard Holdaas, Johan W de Fijter, Josep M Cruzado, Pablo Massari, Björn Nashan, John Kanellis, Oliver Witzke, Alex Gutierrez-Dalmau, Aydin Turkmen, Zailong Wang, Patricia Lopez, Peter Bernhardt, Jossy Kochuparampil, Markus van der Giet, Klaus Murbraech
BACKGROUND: Mammalian target of rapamycin (mTOR) inhibitors may confer cardioprotective advantages but clinical data are limited. METHODS: In the open-label ELEVATE trial, kidney transplant patients were randomized at 10-14 weeks posttransplant to convert from calcineurin inhibitor (CNI) to everolimus or remain on standard CNI therapy. Prespecified endpoints included left ventricular mass index (LVMi) and, in a subpopulation of patients, arterial stiffness as measured by pulse wave velocity (PWV)...
March 22, 2017: Transplantation
https://www.readbyqxmd.com/read/28333369/in-vivo-multiphoton-microscopy-of-picosecond-laser-induced-optical-breakdown-in-human-skin
#20
Mihaela Balu, Griffin Lentsch, Dorota Z Korta, Karsten König, Kristen M Kelly, Bruce J Tromberg, Christopher B Zachary
IMPORTANCE: Improvements in skin appearance resulting from treatment with fractionated picosecond-lasers have been noted, but optimizing the treatment efficacy depends on a thorough understanding of the specific skin response. The development of non-invasive laser imaging techniques in conjunction with laser therapy can potentially provide feedback for guidance and optimizing clinical outcome. OBJECTIVE: The purpose of this study was to demonstrate the capability of multiphoton microscopy (MPM), a high-resolution, label-free imaging technique, to characterize in vivo the skin response to a fractionated non-ablative picosecond-laser treatment...
March 23, 2017: Lasers in Surgery and Medicine
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